South Dakota (USA) is 4.8 times larger than Switzerland.
Area: 41,277 km2 World Factbook
Population: 8,061,516 (July 2014) World Factbook
Switzerland, officially the Swiss Confederation, is a federal parliamentary republic consisting of 26 cantons, with Bern as the seat of the federal authorities, the so-called Bundesstadt. Wikipedia
South Dakota is a state located in the Midwestern region of the United States. It is named after the Lakota and Dakota Sioux Native American tribes. South Dakota is the 17th most extensive, but the 5th least populous and the 5th least densely populated of the 50 United States. Wikipedia